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Note 6 - Renewable Energy Tax Credit Investment (Details Textual)	3 Months Ended
	Sep. 30, 2023 USD ($)
Amortization of Solar Energy Tax Credit Investment	$ 997,000
Income Tax Credits and Adjustments	1,100,000
Financial Standby Letter of Credit [Member]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,000,000
Investment Tax Credit Carryforward [Member]
Tax Credit, Committed Investment in the Tax Credit Producing Entity	1,000,000
Tax Credit, Unfunded Commitment	$ 1,900,000

X

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of solar energy tax credit investment.

+ References

No definition available.

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X

- Definition

Represents the Committed Investment in the Tax Credit Producing Entity

+ References

No definition available.

+ Details

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X

- Definition

Amount of unfunded commitment for tax credit.

+ References

No definition available.

+ Details

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Namespace Prefix:	fcap_
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X

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482425/460-10-50-4

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- Definition

A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

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